exam Maths Puzzle Numerical Ability

find all the values of x satisfying the given conditions:

y = (x+9)^(3/2) and y = 343

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exam Other Question

A moving walkway at an airport is 65.0 m long. A child runing at a constand speek takes 20.0 s to run along the walkway in the direction it is moving, and then 52.0 s to run all the way back. What are the speed of the walkway and the speed of the child? 2 radical 6-radical 6